ci: add test workflow and fix code quality issues

- Add CI test job with Emacs batch load and byte-compile
- Fix settings-file variable check in init.el
- Fix extra parenthesis in init-neotree.el
- Add missing projectile dependencies in neotree and web-mode
- Fix add-hook usage in init-icons.el
- Add hydra dependency in init-ivy.el
- Standardize header style in init-company.el

init.el

@@ -135,7 +135,7 @@
 ;;; Settings
 (setq settings-file (expand-file-name "settings.el" user-emacs-directory))
 ;;; Loads settings file
-(when (file-exists-p custom-file)
+(when (file-exists-p settings-file)
   (load settings-file))
 
 ;; enable erase-buffer command